it just happened to me. with wimdows 7 and windows xp all you have to do is manualy disconnect your internet modem or move out of range from wifi. restart your computer and the block shouldnt pop up because their is no internet connection. go to your control pannel and add another user profile/account (administrator account/ profile) to your pc and delete your old one. ***MAKE SURE YOU SELECT KEEP FILES SO YOU WONT LOSE ANY DOCUMENTS*** after that your pc should be fixed.